Two Younger Dryas glacier phases in the English Lake District: geomorphological evidence and preliminary 10Be exposure dates

There is clear geomorphological evidence for two phases of corrie glaciation at Keskadale in the English Lake District. Two
10Be exposure ages provides preliminary insight into the timing of advance and retreat of the corrie glacier during the Younger
Dryas (12.9-11.7 ka). It is hypothesised in this paper that the corrie glacier at the head of Keskadale reached its maximum
extent early in the Younger Dryas, then retreated to occupy only the upper corrie basin in the later part of this cold interval.
Glacier-climate modelling illustrates that this is consistent with palaeoecological evidence from northern England (and also
numerous studies from Europe) of a climatically-variable Younger Dryas. The geomorphological evidence of multiple advances
or still stands is not restricted to Keskadale but is replicated at sites across the Lake District.